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针对煤矿井下瓦斯检测中常因地下地质结构中含有的即有噪声,以及矿井中使用大量的变频设备所产生的高次谐波和电磁脉冲,使其本来不明显的瓦斯信号变得更加微弱,提出了一种锁相放大实现微弱信号检测的原理,再结合DSP优化算法实现的高速数据处理能力,描述了对该系统的数值及仿真分析,结果表明,该系统能够很好地抑制地质及生产中的噪声影响,恢复、增强和方便提取有用的微弱瓦斯信号,实现了对微弱瓦斯信号的实时在线检测。
In view of the underground coal mine gas detection is often due to the noise contained in the underground geological structure, as well as the use of a large number of frequency conversion equipment in the mine produced by the higher harmonics and electromagnetic pulse, the original obvious not obvious gas signal becomes weaker, put forward A principle of phase-locked amplification for weak signal detection is introduced. Combined with the high-speed data processing capability realized by DSP optimization algorithm, the numerical and simulation analysis of the system is described. The results show that the system can restrain the geology and production Of the noise, restore, enhance and facilitate the extraction of useful weak gas signals, enabling real-time on-line detection of weak gas signals.